. >> reporter: tonight, we hear from michelle obama. she checked out the stage monday. >> she's going to talk about the president that she knows, the husband she married and, of course, the father to her children. >> reporter: maryland's governor and san antonio, texas, mayor also speak tonight. castro is the first latino to give a keynote address here. the same spot president obama had in 2004. >> the first lady, i'm sure, is going to deliver a positive message and. >> reporter: paul ryan told a pack aed north carolina crowd all those speeches will avoid the key question. >> here's the kind of words we're not going to hear. we're not going to hear evidence and facts about how people are better off. >> reporter: vice president biden says we are and here's why. >> osama bin laden is dead and general motors is alive. >> reporter: biden arrives in charlotte today, meantime, mitt romney's relaxing with family in new england rehearsing for october's debate. >> also today, democrats will vote on the party's platform which include higher taxes